Lenovo ThinkPad L420 Hardware Maintenance Manual page 88

When installing: Make sure all the connectors are attached firmly to the system board.
Step Screw (quantity)
6
M2 × 3 mm, flat-head, nylon-coated (1)
7
M2 × 2 mm, flat-head (1)
When installing: Attach the keyboard so that the keyboard edges are under the frame as shown in the
following figure. To make sure that the front side of the keyboard is housed firmly, gently press the keys with
your palms and slightly slide the keyboard toward you until it snaps into position.
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Hardware Maintenance Manual
Color Torque
Black 0.181 Nm
(1.85 kgfcm)
Silver 0.181 Nm
(1.85 kgfcm)